/*
 *                               POK header
 *
 * The following file is a part of the POK project. Any modification should
 * be made according to the POK licence. You CANNOT use this file or a part
 * of a file for your own project.
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2021 POK team
 */

/* k_sinf.c -- float version of k_sin.c
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#ifdef POK_NEEDS_LIBMATH

#include "math_private.h"
#include <libm.h>

static const float half = 5.0000000000e-01, /* 0x3f000000 */
    S1 = -1.6666667163e-01,                 /* 0xbe2aaaab */
    S2 = 8.3333337680e-03,                  /* 0x3c088889 */
    S3 = -1.9841270114e-04,                 /* 0xb9500d01 */
    S4 = 2.7557314297e-06,                  /* 0x3638ef1b */
    S5 = -2.5050759689e-08,                 /* 0xb2d72f34 */
    S6 = 1.5896910177e-10;                  /* 0x2f2ec9d3 */

float __kernel_sinf(float x, float y, int iy) {
  float z, r, v;
  int32_t ix;
  GET_FLOAT_WORD(ix, x);
  ix &= 0x7fffffff;    /* high word of x */
  if (ix < 0x32000000) /* |x| < 2**-27 */
  {
    if ((int)x == 0)
      return x;
  } /* generate inexact */
  z = x * x;
  v = z * x;
  r = S2 + z * (S3 + z * (S4 + z * (S5 + z * S6)));
  if (iy == 0)
    return x + v * (S1 + z * r);
  else
    return x - ((z * (half * y - v * r) - y) - v * S1);
}

#endif
